Whistleblower alleges manipulation of Cboe volatility index

NEW YORK (Reuters) - Wall Street's most widely followed gauge of future stock market volatility is being manipulated, a law firm representing an "anonymous whistleblower" alleged in a letter to U.S. regulators seen by Reuters on Tuesday.

NEW YORK (Reuters) - Wall Street's most widely followed gauge of future stock market volatility is being manipulated, a law firm representing an "anonymous whistleblower" alleged in a letter to U.S. regulators seen by Reuters on Tuesday.